Eric Newton created ACCUMULO-4021:
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Summary: bulk imports slow file garbage collection
Key: ACCUMULO-4021
URL: https://issues.apache.org/jira/browse/ACCUMULO-4021
Project: Accumulo
Issue Type: Bug
Components: gc
Environment: large production system
Reporter: Eric Newton
Assignee: Eric Newton
On a large system, bulk imports slow file garbage collection to a craw. The
total number of files to be deleted was about 14 million. Initially, it would
run quickly, but then slow down, to the point where only a few files would be
deleted every few minutes. The jvm was only using 50% of the CPU (and
therefore, probably not GC thrashing). JStacks showed the collector scanning
the metadata table to remove referenced files from the delete list.
If the bulk ingest requests were stopped, the GC completed quickly.
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